Switch stream creation and closing in Chrome audio rendering from IPC to Mojo

content/renderer/media/audio_message_filter.h

Index: content/renderer/media/audio_message_filter.h
diff --git a/content/renderer/media/audio_message_filter.h b/content/renderer/media/audio_message_filter.h
index 47a5ed8c8da4ee75c2cb5133bd387bf078908e6c..31535b4bc6beb5aae478e91225eea9f704fa5c0b 100644
--- a/content/renderer/media/audio_message_filter.h
+++ b/content/renderer/media/audio_message_filter.h
@@ -19,12 +19,14 @@
 #include "ipc/message_filter.h"
 #include "media/audio/audio_output_ipc.h"
 #include "media/base/audio_hardware_config.h"
+#include "media/mojo/interfaces/audio_output.mojom.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace content {
+class AudioOutputClient;
 
 // MessageFilter that handles audio messages and delegates them to audio
 // renderers. Created on render thread, AudioMessageFilter is operated on
@@ -51,10 +53,16 @@ class CONTENT_EXPORT AudioMessageFilter : public IPC::MessageFilter {
     return io_task_runner_.get();
   }
 
+  // Setter for |audio_output_client_|.
+  void SetAudioOutputClient(content::AudioOutputClient* audio_output_client) {
+   audio_output_client_.reset(audio_output_client);
+  }
+
  protected:
   ~AudioMessageFilter() override;
 
  private:
+  friend class AudioOutputClient;
   FRIEND_TEST_ALL_PREFIXES(AudioMessageFilterTest, Basic);
   FRIEND_TEST_ALL_PREFIXES(AudioMessageFilterTest, Delegates);
 
@@ -95,6 +103,7 @@ class CONTENT_EXPORT AudioMessageFilter : public IPC::MessageFilter {
   // A map of stream ids to delegates; must only be accessed on
   // |io_task_runner_|.
   IDMap<media::AudioOutputIPCDelegate> delegates_;
+  std::unique_ptr<content::AudioOutputClient> audio_output_client_;
 
   // Task runner on which IPC calls are executed.
   const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;